50 = 2 * ( X + Y ) ---> X + Y = 25
X * Y = 150
----------------------------
X = 25 - Y
Y*( 25 - Y) = 150
25Y - Y^2 - 150 = 0
-Y^2 + 25Y - 150 = 0
D = 625 - 4*(-1)*(-150) = 625 - 600= 25
V D = 5
Y1 = ( - 25 + 5 ) : (- 2 ) = ( - 20 ) : ( - 2 ) = 10
Y2 = ( - 30 ) : ( - 2 ) = 15
-------------------
X = 25 - Y
X1 = 25 - 10 = 15
x2 = 25 - 15 = 10
----------------
Cтороны прямоугольника равны 15 см и 10 см